Metal Roofing Materials
Alpine Roofing Construction with 17 years of commercial and residential roofing have the experience to advise you as to what product, roofing system and metal roofing materials to use for your next metal roofing project.
Commercial and Residential metal roofing is generally made of steel (standing seam metal roofing, stone covered metal roofing), aluminum, or copper. Rolls of 24- or 26-gauge steel sheets are given a metallic coating to prevent rust, followed by a baked-on paint finish. Aluminum sheets due to the fact they do not rust get painted.
Copper often called a natural metal product, is neither coated nor painted, because it weathers without corroding. Copper products can be given special treatments to slow oxidation or to speed up the process. Copper roofing is often but not limited to special features, such as the peak of the roof or on feature windows.
Steel roofing products are coated with either zinc (galvanized) or a mixture of aluminum and zinc (galvalume or zincalume). Of the two, galvalume offers the longer service. The coatings are offered in several thicknesses—the thicker the coating the longer the service, and the higher the cost.
The Metal Roofing Association (MRA) recommends a galvanizing thickness level of at least G-90 for residential applications and an AZ-50 or AZ-55 designation for galvalume coatings. In areas by the sea, opt for an aluminum-based panel. Paint finishes vary in quality, as well. An inferior coating may fade or chalk. Some manufacturers participate in a certification process developed by the MRA. Standard certified products may be used in most areas. In areas with high exposure to UV light, opt for a premium certified paint coating.